1.springboot整合redission實(shí)現(xiàn)分布式鎖（基本使用）

1.1.簡(jiǎn)介

??Redisson是架設(shè)在redis基礎(chǔ)上的一個(gè)Java駐內(nèi)存數(shù)據(jù)網(wǎng)格（In-Memory Data Grid）。充分的利用了Redis鍵值數(shù)據(jù)庫(kù)提供的一系列優(yōu)勢(shì)，基于Java實(shí)用工具包中常用接口，為使用者提供了一系列具有分布式特性的常用工具類。使得原本作為協(xié)調(diào)單機(jī)多線程并發(fā)程序的工具包獲得了協(xié)調(diào)分布式多機(jī)多線程并發(fā)系統(tǒng)的能力，大大降低了設(shè)計(jì)和研發(fā)大規(guī)模分布式系統(tǒng)的難度。同時(shí)結(jié)合各富特色的分布式服務(wù)，更進(jìn)一步簡(jiǎn)化了分布式環(huán)境中程序相互之間的協(xié)作。

1.2.相關(guān)依賴pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.xiaoliu</groupId>
    <artifactId>redission</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>redission</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- springboot-start -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <!-- springboot-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- springboot-redis -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <!-- redisson-springboot -->
        <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson-spring-boot-starter</artifactId>
            <version>3.11.4</version>
        </dependency>
        <!-- fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.60</version>
        </dependency>
        <!-- springboot-test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

1.2.配置文件 application.yml

server:
  port: 8090

spring:
  redis:
    host: 122.51.65.35
    database: 0
    timeout: 5000

1.3.編寫測(cè)試類

package com.xiaoliu.redission.lock;

import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Description 測(cè)試下單
 * @Author LL
 * @Date 2020-03-21 10:57
 */
@RestController
public class ShopCartController {


    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Autowired
    private RedissonClient redissonClient;

    private static final String product="MoonCake";

    @GetMapping("/submitOrder")
    public String submitOrder(){

        RLock lock = redissonClient.getLock(product);

        try {
            lock.lock();//阻塞
//            boolean b = lock.tryLock();//非阻塞
            int stock = Integer.parseInt(stringRedisTemplate.opsForValue().get("stock"));
            if (stock>0){
                //下單
                stock-=1;
                stringRedisTemplate.opsForValue().set("stock", String.valueOf(stock));
                System.out.println("扣減成功，庫(kù)存stock："+stock);

            }else {
                //沒庫(kù)存
                System.out.println("扣減失敗，庫(kù)存不足");
            }
        } finally {
            lock.unlock();//釋放鎖
        }
        return "end";
    }
}

1.4.測(cè)試（略）